单轴动态加载下冻土的力学性能实验研究  

Study on dynamic mechanical behaviors of frozen soil under uniaxial loading

作　　者：张海东[1] 朱志武[1,2] 刘煦[1] 

机构地区：[1]西南交通大学力学与工程学院,四川成都610031 [2]冻土工程国家重点实验室,甘肃兰州730000

出　　处：《中国测试》2012年第3期17-19,共3页China Measurement & Test

基　　金：国家自然科学基金项目(11172251);教育部博士点基金项目(20090184120001);冻土工程国家重点实验室开放基金项目(SKLFSE201001)

摘　　要：为研究冻土单轴加载下的冲击动态力学性质,采用分离式霍普金森压杆(SHPB)在-28～-3℃不同负温下对人工冻土进行了应变率范围800～1500s-1的冲击实验。获得了人工冻土在不同温度与不同应变率下的应力应变关系,发现人工冻土具有显著的应变率效应和温度效应,即冻土动强度随应变率增大和温度的降低而增大。单轴高应变率加载下,冻土没有明显的屈服现象,加载后试样完全破坏。A split Hopkinson pressure bar （SHPB） is employed to investigate the dynamics character of artificial frozen soil under uniaxial dynamic compression test at the temperature from -28 ℃ to -3 ~C and strain rates from 800 to 1 500 s^-1 The stress-strain curves at various strain rates and temperature were obtained. The compressive strength of frozen soil shows positive strain-rate and negative temperature sensitivity over the range of strain rates and temperature employed. The frozen soil didn＇t yield during the SHPB tests. The specimens were catastrophically damaged after the uniaxial SHPB tests.

关 键 词：冻土 动态加载 分离式霍普金森压杆 单轴加载 应变率效应 

分 类 号：P642.14[天文地球—工程地质学] TU411.3[天文地球—地质矿产勘探]